Bloom.
She's brave, smart and always cares about the others. She's even the strongest of the Winx members. So, yeah... she has everything what a leader needs.

I think Tecna. Cus she has the brains, she's kind and she loves helping the winx club out.

Tecna's smart, always have a logical explanation, whilst Layla's brave, strong and tough.

Eh, I really don't care. I don't want Musa or Tecna to be the leader because then people will start hating them.

I agree with Musa2002

Because she is smart and great with techonology.

Bloom because everyone hates her. If anyone else were to be the leader, they'll get all the hate too.

^I totally agree with you.

I want Roxy so animals play more parts in Winx Club. I adored Season 4's plot with the pet shop.

She's SMART